A new approach to create layer-by-layer assembled multilayer ultrathin films with well-defined micropatterns in a short process time is introduced. To achieve such micropatterns with high line resolution in organic multilayer films, microfluidic channels were combined with the convective self-assembly process employing both hydrogen bonding and electrostatic intermolecular interactions. The channels were initially filled with polymer solution by capillary pressure, and the residual solution was then removed by the spinning process. Micropatterns with clear line boundaries were obtained, and small ridges were also observed at the edges of the patterned lines.